Goodwill and Intangible Assets (Tables)

6 Months Ended

Mar. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Goodwill Balances

The carrying amount of goodwill attributable to each reportable segment with goodwill balances and the changes in those balances during the six month period ended March 31, 2019 are as follows:

	Reinforcement Materials			Performance Chemicals			Total
	(In millions)
Balance at September 30, 2018	$	52		$	41		$	93
Foreign currency impact		(1	)		(1	)		(2	)
Balance at March 31, 2019	$	51		$	40		$	91

Schedule of Intangible Assets

The following table provides information regarding the Company’s intangible assets:

	March 31, 2019							September 30, 2018
	Gross Carrying Value		Accumulated Amortization			Net Intangible Assets		Gross Carrying Value		Accumulated Amortization			Net Intangible Assets
	(In millions)
Intangible assets with finite lives
Developed technologies	$	51	$	(3	)	$	48	$	52	$	(2	)	$	50
Trademarks		8		—			8		8		—			8
Customer relationships		50		(13	)		37		51		(11	)		40
Total intangible assets	$	109	$	(16	)	$	93	$	111	$	(13	)	$	98